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: Some [[fossil]]s are made when [[organism]]s become trapped in an [[anoxic]] environment where they cannot [[decay]] such as within [[amber]], [[Tar Pit|tar pits]] or under layers of [[ice]].
===FossFossils as Evidence===: [[Fossil]]s are one of the lines of [[Scientific Evidence|scientific evidence]] for [[Evolution by Natural Selection|evolution]].: Since [[sedimentary]] [[rock]]s build up in layers over time [[fossil]]s found in deeper layers are from further in the past. This can be used to date the [[fossil]]s telling us when the [[organism]] died.: [[Fossil]]s provide a number of [[Transitional Form|transitional forms]] showing how some [[species]]s which are not [[extinct]] gradually [[Evolution by Natural Selection|evolved]] over time to form the [[species]] that are alive today.: The [[fossil]] record is not complete as [[Fossil|fossilisation]] is a rare process, so very few [[organism]]s become [[fossil]]s after death. However, there are enough records to show clear [[Scientific Evidence|evidence]] of [[Evolution by Natural Selection|evolution]].